Module: Rufus::Tokyo::HashMethods

Includes:
Enumerable
Included in:
Edo::CabinetCore, Edo::TableCore, Cabinet, Map, Table
Defined in:
lib/rufus/tokyo/hmethods.rb

Overview

A mixin for Cabinet and Map, gathers all the hash-like methods

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#default_proc ⇒ Object

Returns the value of attribute default_proc.



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# File 'lib/rufus/tokyo/hmethods.rb', line 36

def default_proc
  @default_proc
end

Instance Method Details

#[](k) ⇒ Object

The [] methods

(assumes there’s an underlying get(k) method)



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# File 'lib/rufus/tokyo/hmethods.rb', line 42

def [] (k)

  val = get(k)

  return val unless val.nil?
  return nil unless @default_proc

  @default_proc.call(self, k)
end

#default(key = nil) ⇒ Object

Returns the default value, the value that would be returned by h if k did not exist among h keys.



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# File 'lib/rufus/tokyo/hmethods.rb', line 133

def default (key=nil)

  return nil unless @default_proc

  @default_proc.call(self, key) rescue nil
end

#default=(val) ⇒ Object

Sets the default value for the Hash.

Warning : use #default_proc= if you want to change the default_proc directly.



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# File 'lib/rufus/tokyo/hmethods.rb', line 145

def default= (val)

  @default_proc = val.nil? ? nil : lambda { |h, k| val }
end

#each ⇒ Object

Our classical ‘each’



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# File 'lib/rufus/tokyo/hmethods.rb', line 61

def each
  #
  # drop to Edo's C API calls to avoid two-step iteration
  # (keys() then each())
  #
  if defined?(@db) and %w[iterinit iternext].all? { |m| @db.respond_to?(m) }
    @db.iterinit
    while k = @db.iternext
      yield(k, self[k])
    end
  #
  # drop to Tokyo's FFI calls to avoid two-step iteration
  # (keys() then each())
  #
  elsif self.class.name != "Rufus::Tokyo::Table" and # use String for Edo
        defined?(@db)                            and
        respond_to?(:lib)                        and
        %w[abs_iterinit abs_iternext].all? { |m| lib.respond_to?(m) }
    begin
      lib.abs_iterinit(@db)
      int = FFI::MemoryPointer.new(:int)
      loop do
        key_pointer = lib.abs_iternext(@db, int)
        break if key_pointer.address.zero?
        k = key_pointer.get_bytes(0, int.get_int(0))
        yield(k, self[k])
      end
    ensure
      int.free if int
    end
  # we couldn't do it fast, so go ahead with slow-but-accurate
  else
    keys.each { |k| yield(k, self[k]) }
  end
end

#merge(h) ⇒ Object

Returns a new Ruby hash which is a merge of this Map and the given hash



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# File 'lib/rufus/tokyo/hmethods.rb', line 116

def merge (h)

  self.to_h.merge(h)
end

#merge!(h) ⇒ Object

Merges the entries in the given hash into this map



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# File 'lib/rufus/tokyo/hmethods.rb', line 123

def merge! (h)

  h.each { |k, v| self[k] = v }

  self
end

#to_a ⇒ Object

Turns this instance into an array of [ key, value ]



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# File 'lib/rufus/tokyo/hmethods.rb', line 106

def to_a

  #self.collect { |e| e }
    # not OK with ruby 1.9.1

  self.inject([]) { |a, (k, v)| a << [ k, v ]; a }
end

#to_h ⇒ Object

Turns this instance into a Ruby hash



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# File 'lib/rufus/tokyo/hmethods.rb', line 99

def to_h

  self.inject({}) { |h, (k, v)| h[k] = v; h }
end

#values ⇒ Object

Returns an array of all the values



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# File 'lib/rufus/tokyo/hmethods.rb', line 54

def values

  collect { |k, v| v }
end